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java.lang.NullPointerException: 	at com.icesoft.faces.component.tree.Tree.getModel(Tree.java:277)	at com.icesoft.faces.component.tree.Tree.visitRows(Tree.java:1459)	at com.icesoft.faces.component.tree.Tree.visitTree(Tree.java:1414)	at javax.faces.component.UIComponent.visitTree(UIComponent.java:1623)	at javax.faces.component.UIComponent.visitTree(UIComponent.java:1623)	at javax.faces.component.UIComponent.visitTree(UIComponent.java:1623)	at javax.faces.component.UIForm.visitTree(UIForm.java:371)	at javax.faces.component.UIComponent.visitTree(UIComponent.java:1623)	at javax.faces.component.UIComponent.visitTree(UIComponent.java:1623)	at javax.faces.component.UIComponent.visitTree(UIComponent.java:1623)	at javax.faces.component.UIComponent.visitTree(UIComponent.java:1623)	at org.icefaces.impl.event.RestoreResourceDependencies.processEvent(RestoreResourceDependencies.java:24)	at javax.faces.event.SystemEvent.processListener(SystemEvent.java:106)	at com.sun.faces.application.ApplicationImpl.processListeners(ApplicationImpl.java:2169)	at com.sun.faces.application.ApplicationImpl.invokeListenersFor(ApplicationImpl.java:2145)	at com.sun.faces.application.ApplicationImpl.publishEvent(ApplicationImpl.java:303)	at com.sun.faces.application.ApplicationImpl.publishEvent(ApplicationImpl.java:247)	at javax.faces.component.UIComponentBase.encodeBegin(UIComponentBase.java:812)	at javax.faces.component.UIViewRoot.encodeBegin(UIViewRoot.java:963)	at javax.faces.component.UIComponent.encodeAll(UIComponent.java:1777)	at com.sun.faces.application.view.FaceletViewHandlingStrategy.renderView(FaceletViewHandlingStrategy.java:437)	at com.sun.faces.application.view.MultiViewHandler.renderView(MultiViewHandler.java:124)	at com.sun.faces.lifecycle.RenderResponsePhase.execute(RenderResponsePhase.java:120)	at com.sun.faces.lifecycle.Phase.doPhase(Phase.java:101)	at com.sun.faces.lifecycle.LifecycleImpl.render(LifecycleImpl.java:139)	at javax.faces.webapp.FacesServlet.service(FacesServlet.java:594)	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:324)	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:242)	at it.pegaso2000.access.web.filter.AccessFilter.doFilter(AccessFilter.java:77)	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:274)	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:242)	at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:330)	at org.springframework.security.web.access.intercept.FilterSecurityInterceptor.invoke(FilterSecurityInterceptor.java:118)	at org.springframework.security.web.access.intercept.FilterSecurityInterceptor.doFilter(FilterSecurityInterceptor.java:84)	at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342)	at org.springframework.security.web.access.ExceptionTranslationFilter.doFilter(ExceptionTranslationFilter.java:113)	at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342)	at org.springframework.security.web.authentication.logout.LogoutFilter.doFilter(LogoutFilter.java:105)	at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342)	at org.springframework.security.web.authentication.preauth.AbstractPreAuthenticatedProcessingFilter.doFilter(AbstractPreAuthenticatedProcessingFilter.java:94)	at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342)	at org.springframework.security.web.context.SecurityContextPersistenceFilter.doFilter(SecurityContextPersistenceFilter.java:87)	at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342)	at org.springframework.security.web.FilterChainProxy.doFilterInternal(FilterChainProxy.java:192)	at org.springframework.security.web.FilterChainProxy.doFilter(FilterChainProxy.java:160)	at org.springframework.web.filter.DelegatingFilterProxy.invokeDelegate(DelegatingFilterProxy.java:346)	at org.springframework.web.filter.DelegatingFilterProxy.doFilter(DelegatingFilterProxy.java:259)	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:274)	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:242)	at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:275)	at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:161)	at org.jboss.web.tomcat.security.SecurityAssociationValve.invoke(SecurityAssociationValve.java:181)	at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:593)	at org.jboss.modcluster.catalina.CatalinaContext$RequestListenerValve.event(CatalinaContext.java:285)	at org.jboss.modcluster.catalina.CatalinaContext$RequestListenerValve.invoke(CatalinaContext.java:261)	at org.jboss.web.tomcat.security.JaccContextValve.invoke(JaccContextValve.java:88)	at org.jboss.web.tomcat.security.SecurityContextEstablishmentValve.invoke(SecurityContextEstablishmentValve.java:100)	at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:159)	at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)	at org.jboss.web.tomcat.service.jca.CachedConnectionValve.invoke(CachedConnectionValve.java:158)	at org.apache.catalina.authenticator.SingleSignOn.invoke(SingleSignOn.java:416)	at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)	at org.jboss.web.tomcat.service.request.ActiveRequestResponseCacheValve.invoke(ActiveRequestResponseCacheValve.java:53)	at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:362)	at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:877)	at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:654)	at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:951)	at java.lang.Thread.run(Thread.java:722)